442 ME. G. M. THOMSON OX THE NEW ZEALAND 



the first four joints as normal, and then regard all those between the fourth and the 

 ])ropodos as forming the carpos, then the latter is nine-jointed. But a glance at the 

 limb itself seems to suggest that this is a forced and not very natural mode of treating it. 

 The normal mode of folding the limb into three parts takes place at what I have assumed 

 to be tbe distal ends of the ischium and meros respectively. On the other assumption I 

 should describe the ischium and meros as straight, the latter about half as long as the 

 former, the carpos as nine-jointed, first joint about as long as the two preceding, second 

 half as long, remaining seven usually bent at a considerable angle and not quite so long 

 as the first two. 



The third to the fifth pereiopoda are avoII developed and diminish in size posteriorly. 

 The dactyla (fig. 12) are strongly toothed below so as to l)e two-clawed. 



A small tubercle projects from the sternum between the bases of the third pereiopoda, 

 and a larger keeled protuberance between the bases of the fourth pair. This latter sternal 

 segment is produced posteriorly into two small acute lobes (fig. 3). 



The first pleopoda in the males have a stout basal joint longitudinally folded at right 

 angles ; the two foliaceous plates are slender and acute, and the outer projects 

 outwardly nearly at right angles to the inner, so as to stick out from the sides of 

 the animal like two minute fans. 



The succeeding three pairs of pleopoda have the basal joints rather long and stout, and 

 the foliaceous plates subequal with them in length. Tiie fifth pair are shorter and 

 thicker. 



The sixth pair have the foliaceous plates subequal, narrow and rounded at the end, 

 and somewhat exceeding the telson in length. 



The dimensions of a male specimen were : — 



min. 



tMitire length 77 



Leiigtli of caraj)ace to exti'eniity of rostrum 25 



Depth of carapace 14 



Length of rostrum from first dorsal tooth 11 



„ i)lcoii 52 



,, telsou 12 



,, first antoniup 28 



,, second anteiiuie 85 



,, peduncle of same 12 



,, external maxillipeds 5i 



,, first pereiopoda 33 



,, second pereiopoda 37 



Uahitat. I have only met with this species in rock-pools from the following localities . — 

 Cape Cami)bell, Sumner, Moeraki, Otago Heads, and Stewart Island. Eilholalso records 

 it from Cook Straits. 



Distribidioii. Australia. 



